1 /* Target-dependent code for OpenVMS IA-64. 2 3 Copyright (C) 2012-2023 Free Software Foundation, Inc. 4 5 This file is part of GDB. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 19 20 #include "defs.h" 21 #include "frame-unwind.h" 22 #include "ia64-tdep.h" 23 #include "osabi.h" 24 #include "gdbtypes.h" 25 #include "gdbcore.h" 26 #include "gdbarch.h" 27 28 #ifdef HAVE_LIBUNWIND_IA64_H 29 30 /* Libunwind callback accessor function to acquire procedure unwind-info. */ 31 32 static int 33 ia64_vms_find_proc_info_x (unw_addr_space_t as, unw_word_t ip, 34 unw_proc_info_t *pi, 35 int need_unwind_info, void *arg) 36 { 37 enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); 38 gdb_byte buf[32]; 39 const char *annex = core_addr_to_string (ip); 40 LONGEST res; 41 CORE_ADDR table_addr; 42 unsigned int info_len; 43 44 res = target_read (current_inferior ()->top_target (), 45 TARGET_OBJECT_OPENVMS_UIB, 46 annex + 2, buf, 0, sizeof (buf)); 47 48 if (res != sizeof (buf)) 49 return -UNW_ENOINFO; 50 51 pi->format = UNW_INFO_FORMAT_REMOTE_TABLE; 52 pi->start_ip = extract_unsigned_integer (buf + 0, 8, byte_order); 53 pi->end_ip = extract_unsigned_integer (buf + 8, 8, byte_order); 54 pi->gp = extract_unsigned_integer (buf + 24, 8, byte_order); 55 table_addr = extract_unsigned_integer (buf + 16, 8, byte_order); 56 57 if (table_addr == 0) 58 { 59 /* No unwind data. */ 60 pi->unwind_info = NULL; 61 pi->unwind_info_size = 0; 62 return 0; 63 } 64 65 res = target_read_memory (table_addr, buf, 8); 66 if (res != 0) 67 return -UNW_ENOINFO; 68 69 /* Check version. */ 70 if (extract_unsigned_integer (buf + 6, 2, byte_order) != 1) 71 return -UNW_EBADVERSION; 72 info_len = extract_unsigned_integer (buf + 0, 4, byte_order); 73 pi->unwind_info_size = 8 * info_len; 74 75 /* Read info. */ 76 pi->unwind_info = xmalloc (pi->unwind_info_size); 77 78 res = target_read_memory (table_addr + 8, 79 (gdb_byte *) pi->unwind_info, pi->unwind_info_size); 80 if (res != 0) 81 { 82 xfree (pi->unwind_info); 83 pi->unwind_info = NULL; 84 return -UNW_ENOINFO; 85 } 86 87 /* FIXME: Handle OSSD (OS Specific Data). This extension to ia64 unwind 88 information by OpenVMS is currently not handled by libunwind, but 89 looks to be used only in very specific context, and is not generated by 90 GCC. */ 91 92 pi->lsda = table_addr + 8 + pi->unwind_info_size; 93 if (extract_unsigned_integer (buf + 4, 2, byte_order) & 3) 94 { 95 pi->lsda += 8; 96 /* There might be an handler, but this is not used for unwinding. */ 97 pi->handler = 0; 98 } 99 100 return 0; 101 } 102 103 /* Libunwind callback accessor function for cleanup. */ 104 105 static void 106 ia64_vms_put_unwind_info (unw_addr_space_t as, 107 unw_proc_info_t *pip, void *arg) 108 { 109 /* Nothing required for now. */ 110 } 111 112 /* Libunwind callback accessor function to get head of the dynamic 113 unwind-info registration list. */ 114 115 static int 116 ia64_vms_get_dyn_info_list (unw_addr_space_t as, 117 unw_word_t *dilap, void *arg) 118 { 119 return -UNW_ENOINFO; 120 } 121 122 /* Set of libunwind callback acccessor functions. */ 123 static unw_accessors_t ia64_vms_unw_accessors; 124 static unw_accessors_t ia64_vms_unw_rse_accessors; 125 126 /* Set of ia64-libunwind-tdep gdb callbacks and data for generic 127 ia64-libunwind-tdep code to use. */ 128 static struct libunwind_descr ia64_vms_libunwind_descr; 129 130 #endif /* HAVE_LIBUNWIND_IA64_H */ 131 132 static void 133 ia64_openvms_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) 134 { 135 set_gdbarch_long_double_format (gdbarch, floatformats_ieee_quad); 136 137 #ifdef HAVE_LIBUNWIND_IA64_H 138 /* Override the default descriptor. */ 139 ia64_vms_unw_accessors = ia64_unw_accessors; 140 ia64_vms_unw_accessors.find_proc_info = ia64_vms_find_proc_info_x; 141 ia64_vms_unw_accessors.put_unwind_info = ia64_vms_put_unwind_info; 142 ia64_vms_unw_accessors.get_dyn_info_list_addr = ia64_vms_get_dyn_info_list; 143 144 ia64_vms_unw_rse_accessors = ia64_unw_rse_accessors; 145 ia64_vms_unw_rse_accessors.find_proc_info = ia64_vms_find_proc_info_x; 146 ia64_vms_unw_rse_accessors.put_unwind_info = ia64_vms_put_unwind_info; 147 ia64_vms_unw_rse_accessors.get_dyn_info_list_addr = ia64_vms_get_dyn_info_list; 148 149 ia64_vms_libunwind_descr = ia64_libunwind_descr; 150 ia64_vms_libunwind_descr.accessors = &ia64_vms_unw_accessors; 151 ia64_vms_libunwind_descr.special_accessors = &ia64_vms_unw_rse_accessors; 152 153 libunwind_frame_set_descr (gdbarch, &ia64_vms_libunwind_descr); 154 #endif 155 } 156 157 void _initialize_ia64_vms_tdep (); 158 void 159 _initialize_ia64_vms_tdep () 160 { 161 gdbarch_register_osabi (bfd_arch_ia64, 0, GDB_OSABI_OPENVMS, 162 ia64_openvms_init_abi); 163 } 164